Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 83, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 21, 2011, 7:10 PM CDT for Burnet County, Travis County, Williamson County, Texas. It was in force for 50 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 21, 2011, 7:10 PM CDT (00:10 UTC)
- Expired
- May 21, 2011, 8:00 PM CDT
- In force
- 50 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Storm-based polygon
Counties Burnet County, TX, Travis County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 61 km from the middle of the area, began a volume at 00:11 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 21, 7:11 PM CDT | HAIL 1 | Bertram, TX | |
| May 21, 7:30 PM CDT | FUNNEL CLOUD | 5 W Bertram, TX | |
| May 21, 7:32 PM CDT | FUNNEL CLOUD | Bertram, TX | SPOTTER NEAR BERTRAM SEES A WALL CLOUD ROTATING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 21, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 0.2 hours before the alert went out and 244 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 3908 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 978 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 116 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 16.6
The text
As transmitted, in the capitals the NWS used until 2016.
163 WUUS54 KEWX 220010 SVREWX TXC053-453-491-220100- /O.NEW.KEWX.SV.W.0083.110522T0010Z-110522T0100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 710 PM CDT SAT MAY 21 2011 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL BURNET COUNTY... EXTREME NORTHWESTERN TRAVIS COUNTY... WEST CENTRAL WILLIAMSON COUNTY... * UNTIL 800 PM CDT. * AT 705 PM CDT...NWS METEOROLOGISTS HAVE DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BERTRAM...AND MOVING SOUTHEAST AT 20 MPH. * SOME LOCATIONS IN THE WARNING INCLUDE OATMEAL. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. && LAT...LON 3074 9787 3057 9800 3072 9823 3087 9812 TIME...MOT...LOC 0010Z 303DEG 19KT 3074 9808 $$
2 follow-up statements
547 WWUS54 KEWX 220028 SVSEWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 728 PM CDT SAT MAY 21 2011 TXC053-453-491-220100- /O.CON.KEWX.SV.W.0083.000000T0000Z-110522T0100Z/ BURNET TX-WILLIAMSON TX-TRAVIS TX- 728 PM CDT SAT MAY 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR EXTREME NORTHWESTERN TRAVIS...WEST CENTRAL WILLIAMSON AND CENTRAL BURNET COUNTIES... AT 719 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BERTRAM AND NEAR THE INTERSECTION OF HIGHWAY 29 AND FM 1174...MOVING SOUTHEAST AT 20 MPH. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. && LAT...LON 3074 9787 3057 9800 3072 9823 3087 9812 TIME...MOT...LOC 0026Z 302DEG 19KT 3074 9803 $$
787 WWUS54 KEWX 220042 SVSEWX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 742 PM CDT SAT MAY 21 2011 TXC453-220052- /O.CAN.KEWX.SV.W.0083.000000T0000Z-110522T0100Z/ TRAVIS TX- 742 PM CDT SAT MAY 21 2011 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHWESTERN TRAVIS COUNTY IS CANCELLED... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. LAT...LON 3074 9787 3065 9794 3075 9817 3087 9812 TIME...MOT...LOC 0042Z 279DEG 20KT 3077 9801 $$ TXC053-491-220100- /O.CON.KEWX.SV.W.0083.000000T0000Z-110522T0100Z/ BURNET TX-WILLIAMSON TX- 742 PM CDT SAT MAY 21 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR WEST CENTRAL WILLIAMSON AND CENTRAL BURNET COUNTIES... AT 736 PM CDT...NWS METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR BERTRAM... MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT SATURDAY EVENING FOR SOUTH CENTRAL TEXAS. && LAT...LON 3074 9787 3065 9794 3075 9817 3087 9812 TIME...MOT...LOC 0042Z 279DEG 18KT 3077 9801 $$
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:27 PM CDT | Tornado Warning | EWX | Burnet, Williamson | 33 min |
| May 21, 7:44 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 min |
| May 21, 7:50 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Llano | 40 min |
| May 21, 7:59 PM CDT | Tornado Warning | EWX | Burnet, Williamson | 31 min |
| May 21, 8:08 PM CDT | Areal Flood Advisory | EWX | Burnet, Williamson | 112 min |
| May 21, 8:11 PM CDT | Tornado Warning | EWX | Burnet, Llano | 34 min |
| May 21, 8:27 PM CDT | Severe Thunderstorm Warning | EWX | Williamson | 48 min |
| May 21, 8:27 PM CDT | Tornado Warning | EWX | Williamson | 33 min |
| May 21, 8:32 PM CDT | Severe Thunderstorm Warning | EWX | Burnet | 43 min |
| May 21, 8:44 PM CDT | Tornado Warning | EWX | Burnet | 31 min |
| May 21, 8:59 PM CDT | Tornado Warning | EWX | Williamson | 31 min |
| May 21, 9:14 PM CDT | Severe Thunderstorm Warning | EWX | Burnet, Williamson | 46 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.